Authorities say the fatal shootings of a pregnant woman and a man found dead at a Pennsylvania apartment building appear to be a murder-suicide.

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Police responded to the building in Cecil around 7:15 p.m. Wednesday following reports of shots fired inside a unit. They eventually sent a robot equipped with a camera into the apartment to investigate and soon discovered the bodies of 38-year-old Nadder Rizk, of Cecil, and 35-year-old Michelle Krek, of Bridgeville.

Authorities say the couple was apparently involved in a domestic dispute, but further details have not been disclosed. They say Rizk lived in the apartment and Krek was about 7 months pregnant.

Michelle Krek's sister, Danni, told WTAE she can't make sense of what happened to her sister.

“She was my other half. We were just so close,” said Danni Krek. “My sister was literally the most happy, loving person you could find and anyone who knew her would say the same thing. She lit up a room. She had this boisterous personality and was just so happy and loving."

Family members and loved ones had recently thrown Michelle Krek a baby shower. She had planned to name her child Logan.

“My brother made big toy boxes and growth charts. We couldn't have bought any more stuff for this baby. We were just so excited to finally have a baby,” said Danni Krek.

Rizk attended the gathering and everything seemed "fine," according to Danni Krek.

“He was 100 percent the father. He was at every single appointment. He was very hands-on with planning everything. He was just as happy. He was at the shower just as excited about everything to come,” said Danni Krek.

Now Michelle Krek's family is making arrangements to say goodbye to the mother-to-be and her unborn son.

“I don't think you could ever have a warning sign for someone who is going to do the most horrific thing you can possibly do. It was so senseless,” said Danni Krek.